513 Single Shaft MT Cost Considerations

The prime consideration in any MT design is this: can the developed product successfully compete in the open market and against other generation technologies against the cost of utility power supply? Chapter 8 considers all

FIGURE 5.3

Generator performance map (power kWe as a function of rotational speed, Krpm). The generator section drawing shows the rotor (crosshatched) and the fixed stator. The lines of constant gap D slope upward to the right while lines of constant tip speed U (meters per second) slope downward to the right.

FIGURE 5.3

Generator performance map (power kWe as a function of rotational speed, Krpm). The generator section drawing shows the rotor (crosshatched) and the fixed stator. The lines of constant gap D slope upward to the right while lines of constant tip speed U (meters per second) slope downward to the right.

factors affecting these matters in detail. Even without a detailed analysis, it is clear that the non-recuperated cycle MT configuration would have difficulty competing on an operating cost basis unless coupled with some form of waste heat recovery. Thus, market opportunities for non-recuperated machines will probably be confined to standby power generation.

Variable MT costs include the heat engine assembly itself, the recuperator, and the generator. On the other hand, MT engine accessory and control costs tend to remain nearly constant, i.e., independent of size. Engine control costs also do not follow scalar relationships, since control dynamic relationships (apart from inertial effects) are relatively independent of size.

Typical microturbine system cost percentages are of the order:

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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